<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>原生JS实现球面展示特效</title>
    <style>
        body {
            background-color: #000;
        }

        #div1 {
            position: relative;
            width: 450px;
            height: 450px;
            margin: 20px auto 0
        }

        #div1 a {
            position: absolute;
            top: 0px;
            left: 0px;
            font-family: Microsoft YaHei;
            color: #fff;
            font-weight: bold;
            text-decoration: none;
            padding: 3px 6px
        }

        #div1 a:hover {
            border: 1px solid #eee;
            background: #000
        }

        #div1 .blue {
            color: blue
        }

        #div1 .red {
            color: red
        }

        #div1 .yellow {
            color: yellow
        }

        p {
            font: 16px Microsoft YaHei;
            text-align: center;
            color: #ba0c0c
        }

        p a {
            font-size: 14px;
            color: #ba0c0c
        }

        p a:hover {
            color: red
        }
    </style>

</head>

<body>
    <div id="div1">
        <a>JS课程</a>
        <a class="red">教程</a>
        <a>试听</a>
        <a>精品</a>
        <a class="blue">视频</a>
        <a>SEO</a>
        <a class="red">特效</a>
        <a class="yellow">JavaScript</a>
        <a>Baidu</a>
        <a class="red">CSS</a>
        <a>求职</a>
        <a class="blue">书籍</a>
        <a>继承</a>
        <a class="red">课程</a>
        <a class="blue">OOP</a>
        <a>XHTML</a>
        <a class="blue">setInterval</a>
        <a>W3C</a>
        <a>阿里</a>
        <a class="yellow">代码</a>
        <a>华为</a>
    </div>
    <script>
        var radius = 120;
        var dtr = Math.PI / 180;
        var d = 300;
        var mcList = [];
        var active = false;
        var lasta = 1;
        var lastb = 1;
        var distr = true;
        var tspeed = 10;
        var size = 250;

        var mouseX = 0;
        var mouseY = 0;

        var howElliptical = 1;

        var aA = null;
        var oDiv = null;

        window.onload = function () {

            var i = 0;
            var oTag = null;

            oDiv = document.getElementById('div1');

            aA = oDiv.getElementsByTagName('a');

            for (i = 0; i < aA.length; i++) {
                oTag = {};

                oTag.offsetWidth = aA[i].offsetWidth;
                oTag.offsetHeight = aA[i].offsetHeight;

                mcList.push(oTag);
            }

            sineCosine(0, 0, 0);

            positionAll();

            oDiv.onmouseover = function () {
                active = true;
            };

            oDiv.onmouseout = function () {
                active = false;
            };

            oDiv.onmousemove = function (ev) {
                var oEvent = window.event || ev;

                mouseX = oEvent.clientX - (oDiv.offsetLeft + oDiv.offsetWidth / 2);
                mouseY = oEvent.clientY - (oDiv.offsetTop + oDiv.offsetHeight / 2);

                mouseX /= 5;
                mouseY /= 5;
            };

            setInterval(update, 30);
        };

        function update() {
            var a;
            var b;

            if (active) {
                a = (-Math.min(Math.max(-mouseY, -size), size) / radius) * tspeed;
                b = (Math.min(Math.max(-mouseX, -size), size) / radius) * tspeed;
            } else {
                a = lasta * 0.98;
                b = lastb * 0.98;
            }

            lasta = a;
            lastb = b;

            if (Math.abs(a) <= 0.01 && Math.abs(b) <= 0.01) {
                return;
            }

            var c = 0;
            sineCosine(a, b, c);
            for (var j = 0; j < mcList.length; j++) {
                var rx1 = mcList[j].cx;
                var ry1 = mcList[j].cy * ca + mcList[j].cz * (-sa);
                var rz1 = mcList[j].cy * sa + mcList[j].cz * ca;

                var rx2 = rx1 * cb + rz1 * sb;
                var ry2 = ry1;
                var rz2 = rx1 * (-sb) + rz1 * cb;

                var rx3 = rx2 * cc + ry2 * (-sc);
                var ry3 = rx2 * sc + ry2 * cc;
                var rz3 = rz2;

                mcList[j].cx = rx3;
                mcList[j].cy = ry3;
                mcList[j].cz = rz3;

                per = d / (d + rz3);

                mcList[j].x = (howElliptical * rx3 * per) - (howElliptical * 2);
                mcList[j].y = ry3 * per;
                mcList[j].scale = per;
                mcList[j].alpha = per;

                mcList[j].alpha = (mcList[j].alpha - 0.6) * (10 / 6);
            }

            doPosition();
            depthSort();
        };

        function depthSort() {
            var i = 0;
            var aTmp = [];

            for (i = 0; i < aA.length; i++) {
                aTmp.push(aA[i]);
            }

            aTmp.sort(
                function (vItem1, vItem2) {
                    if (vItem1.cz > vItem2.cz) {
                        return -1;
                    } else if (vItem1.cz < vItem2.cz) {
                        return 1;
                    } else {
                        return 0;
                    }
                }
            );

            for (i = 0; i < aTmp.length; i++) {
                aTmp[i].style.zIndex = i;
            }
        };

        function positionAll() {
            var phi = 0;
            var theta = 0;
            var max = mcList.length;
            var i = 0;

            var aTmp = [];
            var oFragment = document.createDocumentFragment();


            for (i = 0; i < aA.length; i++) {
                aTmp.push(aA[i]);
            }

            aTmp.sort(
                function () {
                    return Math.random() < 0.5 ? 1 : -1;
                }
            );

            for (i = 0; i < aTmp.length; i++) {
                oFragment.appendChild(aTmp[i]);
            }

            oDiv.appendChild(oFragment);

            for (var i = 1; i < max + 1; i++) {
                if (distr) {
                    phi = Math.acos(-1 + (2 * i - 1) / max);
                    theta = Math.sqrt(max * Math.PI) * phi;
                } else {
                    phi = Math.random() * (Math.PI);
                    theta = Math.random() * (2 * Math.PI);
                }

                mcList[i - 1].cx = radius * Math.cos(theta) * Math.sin(phi);
                mcList[i - 1].cy = radius * Math.sin(theta) * Math.sin(phi);
                mcList[i - 1].cz = radius * Math.cos(phi);

                aA[i - 1].style.left = mcList[i - 1].cx + oDiv.offsetWidth / 2 - mcList[i - 1].offsetWidth / 2 + 'px';
                aA[i - 1].style.top = mcList[i - 1].cy + oDiv.offsetHeight / 2 - mcList[i - 1].offsetHeight / 2 + 'px';
            }
        };

        function doPosition() {
            var l = oDiv.offsetWidth / 2;
            var t = oDiv.offsetHeight / 2;
            for (var i = 0; i < mcList.length; i++) {
                aA[i].style.left = mcList[i].cx + l - mcList[i].offsetWidth / 2 + 'px';
                aA[i].style.top = mcList[i].cy + t - mcList[i].offsetHeight / 2 + 'px';

                aA[i].style.fontSize = Math.ceil(12 * mcList[i].scale / 2) + 8 + 'px';

                aA[i].style.filter = "alpha(opacity=" + 100 * mcList[i].alpha + ")";
                aA[i].style.opacity = mcList[i].alpha;
            }
        };

        function sineCosine(a, b, c) {
            sa = Math.sin(a * dtr);
            ca = Math.cos(a * dtr);
            sb = Math.sin(b * dtr);
            cb = Math.cos(b * dtr);
            sc = Math.sin(c * dtr);
            cc = Math.cos(c * dtr);
        }

    </script>
</body>

</html>